Makefile for kernel module - error

Question

I made a simple kernel module and a defult Makefile I was given in lecture.

obj-m += module.o

all:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

I'm getting the error

make[1]: Entering directory '/usr/src/linux-headers-4.15.0-142-generic'
make[2]: *** No rule to make target 
'/home/fw/Documents/Workshop_in_Information_Security/module.c', needed by 
'/home/fw/Documents/Workshop_in_Information_Security/module.o'.  Stop.
Makefile:1584: recipe for target 
'_module_/home/fw/Documents/Workshop_in_Information_Security' failed
make[1]: *** [_module_/home/fw/Documents/Workshop_in_Information_Security] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.15.0-142-generic'
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 2

I'm running on ubuntu and I have these lines in my module

module_init(nf_minifirewall_init_function);
module_exit(my_module_exit_function);

I'm very new to this subject so if needed any more information let me know. Thank you